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Modeling of Neptunium(V) Sorption Behavior onto Iron-Containing Minerals

Published online by Cambridge University Press:  15 February 2011

T. Fujita ,
M. Tsukamoto ,
T. Ohe ,
S. Nakayama  and
Y. Sakamoto
T. Fujita
Affiliation:
Central Research Institute of Electric Power Industry (CRIEPI)2–11–1, Iwado-Kita, Komae, Tokyo 201, Japan
M. Tsukamoto
Affiliation:
Central Research Institute of Electric Power Industry (CRIEPI)2–11–1, Iwado-Kita, Komae, Tokyo 201, Japan
T. Ohe
Affiliation:
Central Research Institute of Electric Power Industry (CRIEPI)2–11–1, Iwado-Kita, Komae, Tokyo 201, Japan
S. Nakayama
Affiliation:
Japan Atomic Energy Research Institute (JAERI)Tokai, Naka, Ibaraki 319–11, Japan
Y. Sakamoto
Affiliation:
Japan Atomic Energy Research Institute (JAERI)Tokai, Naka, Ibaraki 319–11, Japan
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Abstract

Sorption behaviors of neptunium (V) on naturally-occurring magnetite (Fe3O4) and goethite (α-FeOOH) in 0.1M NaN03 electrolyte solution under aerobic conditions were interpreted using the surface complexation model (SCM). The surface properties of these materials were experimentally investigated by C02-free potentiometric titration, and SCM parameters for the constant capacitance model, such as protonation/deprotonation constants of the surface hydroxyl group, were determined. The number of negatively charged sorption sites of goethite rapidly increased with the increase of the bulk solution pH compared with that of magnetite and this tendency was similar to the pH dependence of neptunium sorption. This implies that the neptunyl cation, NpO2+, plays a dominant role in possible sorption reactions. Assuming that the dominant surface complex is XO-NpO2, modeling by means of SCM was carried out, and the results were found to agree with experimental data.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 965
Copyright
Copyright © Materials Research Society 1995

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References

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